void MapWindow::Event_PanCursor(int dx, int dy) {
int X= (MapRect.right+MapRect.left)/2;
int Y= (MapRect.bottom+MapRect.top)/2;
double Xstart, Ystart, Xnew, Ynew;
Screen2LatLon(X, Y, Xstart, Ystart);
X+= (MapRect.right-MapRect.left)*dx/4;
Y+= (MapRect.bottom-MapRect.top)*dy/4;
Screen2LatLon(X, Y, Xnew, Ynew);
if(mode.AnyPan()) {
PanLongitude += Xstart-Xnew;
PanLatitude += Ystart-Ynew;
}
RefreshMap();
}
rectObj MapWindow::CalculateScreenBounds(double scale, const RECT& rc) {
// compute lat lon extents of visible screen
rectObj sb;
if (scale>= 1.0) {
POINT screen_center;
LatLon2Screen(PanLongitude,
PanLatitude,
screen_center);
sb.minx = sb.maxx = PanLongitude;
sb.miny = sb.maxy = PanLatitude;
unsigned int dx, dy;
unsigned int maxsc=0;
dx = screen_center.x-rc.right;
dy = screen_center.y-rc.top;
maxsc = max(maxsc, dx*dx+dy*dy);
dx = screen_center.x-rc.left;
dy = screen_center.y-rc.top;
maxsc = max(maxsc, dx*dx+dy*dy);
dx = screen_center.x-rc.left;
dy = screen_center.y-rc.bottom;
maxsc = max(maxsc, dx*dx+dy*dy);
dx = screen_center.x-rc.right;
dy = screen_center.y-rc.bottom;
maxsc = max(maxsc, dx*dx+dy*dy);
maxsc = isqrt4(maxsc);
for (int i=0; i<10; i++) {
double ang = i*360.0/10;
POINT p;
double X, Y;
p.x = screen_center.x + iround(fastcosine(ang)*maxsc*scale);
p.y = screen_center.y + iround(fastsine(ang)*maxsc*scale);
Screen2LatLon(p.x, p.y, X, Y);
sb.minx = min(X, sb.minx);
sb.miny = min(Y, sb.miny);
sb.maxx = max(X, sb.maxx);
sb.maxy = max(Y, sb.maxy);
}
} else {
double xmin, xmax, ymin, ymax;
int x, y;
double X, Y;
x = rc.left;
y = rc.top;
Screen2LatLon(x, y, X, Y);
xmin = X;
xmax = X;
ymin = Y;
ymax = Y;
x = rc.right;
y = rc.top;
Screen2LatLon(x, y, X, Y);
xmin = min(xmin, X);
xmax = max(xmax, X);
ymin = min(ymin, Y);
ymax = max(ymax, Y);
x = rc.right;
y = rc.bottom;
Screen2LatLon(x, y, X, Y);
xmin = min(xmin, X);
xmax = max(xmax, X);
ymin = min(ymin, Y);
ymax = max(ymax, Y);
x = rc.left;
y = rc.bottom;
Screen2LatLon(x, y, X, Y);
xmin = min(xmin, X);
xmax = max(xmax, X);
ymin = min(ymin, Y);
ymax = max(ymax, Y);
sb.minx = xmin;
sb.maxx = xmax;
sb.miny = ymin;
sb.maxy = ymax;
}
return sb;
}
